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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d0c2d2e1b30f1713de1ae6ea17ee42c50bfdd68ef8c3ef0d1837bc48851a4c' 
  AND token = 'ifg/A/CEMR2YoG/jcecx/9Do5eWyZOHzMficnnTdhIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}